Make the assumption on the minimum buffer size for GetLogLines explicit.

src/api.cc

 // Copyright 2009 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 3562 matching lines @@
 #ifdef ENABLE_LOGGING_AND_PROFILING
   return i::Logger::GetActiveProfilerModules();
 #else
   return PROFILER_MODULE_NONE;
 #endif
 }
 
 
 int V8::GetLogLines(int from_pos, char* dest_buf, int max_size) {
 #ifdef ENABLE_LOGGING_AND_PROFILING
+  ASSERT(max_size >= kMinimumSizeForLogLinesBuffer);
   return i::Logger::GetLogLines(from_pos, dest_buf, max_size);
 #endif
   return 0;
 }
 
 
 int V8::GetCurrentThreadId() {
   API_ENTRY_CHECK("V8::GetCurrentThreadId()");
   EnsureInitialized("V8::GetCurrentThreadId()");
   return i::Top::thread_id();
@@ skipping 406 matching lines @@
 
 
 char* HandleScopeImplementer::Iterate(ObjectVisitor* v, char* storage) {
   HandleScopeImplementer* thread_local =
       reinterpret_cast<HandleScopeImplementer*>(storage);
   thread_local->IterateThis(v);
   return storage + ArchiveSpacePerThread();
 }
 
 } }  // namespace v8::internal